Chris@909: # Redmine - project management software
Chris@909: # Copyright (C) 2006-2011  Jean-Philippe Lang
Chris@909: #
Chris@909: # This program is free software; you can redistribute it and/or
Chris@909: # modify it under the terms of the GNU General Public License
Chris@909: # as published by the Free Software Foundation; either version 2
Chris@909: # of the License, or (at your option) any later version.
Chris@909: #
Chris@909: # This program is distributed in the hope that it will be useful,
Chris@909: # but WITHOUT ANY WARRANTY; without even the implied warranty of
Chris@909: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
Chris@909: # GNU General Public License for more details.
Chris@909: #
Chris@909: # You should have received a copy of the GNU General Public License
Chris@909: # along with this program; if not, write to the Free Software
Chris@909: # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
Chris@909: 
Chris@909: module Redmine
Chris@909:   module Ciphering
Chris@909:     def self.included(base)
Chris@909:       base.extend ClassMethods
Chris@909:     end
Chris@909: 
Chris@909:     class << self
Chris@909:       def encrypt_text(text)
Chris@909:         if cipher_key.blank? || text.blank?
Chris@909:           text
Chris@909:         else
Chris@909:           c = OpenSSL::Cipher::Cipher.new("aes-256-cbc")
Chris@909:           iv = c.random_iv
Chris@909:           c.encrypt
Chris@909:           c.key = cipher_key
Chris@909:           c.iv = iv
Chris@909:           e = c.update(text.to_s)
Chris@909:           e << c.final
Chris@909:           "aes-256-cbc:" + [e, iv].map {|v| Base64.encode64(v).strip}.join('--')
Chris@909:         end
Chris@909:       end
Chris@909: 
Chris@909:       def decrypt_text(text)
Chris@909:         if text && match = text.match(/\Aaes-256-cbc:(.+)\Z/)
Chris@909:           if cipher_key.blank?
Chris@909:             logger.error "Attempt to decrypt a ciphered text with no cipher key configured in config/configuration.yml" if logger
Chris@909:             return text
Chris@909:           end
Chris@909:           text = match[1]
Chris@909:           c = OpenSSL::Cipher::Cipher.new("aes-256-cbc")
Chris@909:           e, iv = text.split("--").map {|s| Base64.decode64(s)}
Chris@909:           c.decrypt
Chris@909:           c.key = cipher_key
Chris@909:           c.iv = iv
Chris@909:           d = c.update(e)
Chris@909:           d << c.final
Chris@909:         else
Chris@909:           text
Chris@909:         end
Chris@909:       end
Chris@909: 
Chris@909:       def cipher_key
Chris@909:         key = Redmine::Configuration['database_cipher_key'].to_s
Chris@909:         key.blank? ? nil : Digest::SHA256.hexdigest(key)
Chris@909:       end
Chris@909:       
Chris@909:       def logger
Chris@909:         Rails.logger
Chris@909:       end
Chris@909:     end
Chris@909: 
Chris@909:     module ClassMethods
Chris@909:       def encrypt_all(attribute)
Chris@909:         transaction do
Chris@909:           all.each do |object|
Chris@909:             clear = object.send(attribute)
Chris@909:             object.send "#{attribute}=", clear
Chris@909:             raise(ActiveRecord::Rollback) unless object.save(false)
Chris@909:           end
Chris@909:         end ? true : false
Chris@909:       end
Chris@909: 
Chris@909:       def decrypt_all(attribute)
Chris@909:         transaction do
Chris@909:           all.each do |object|
Chris@909:             clear = object.send(attribute)
Chris@909:             object.write_attribute attribute, clear
Chris@909:             raise(ActiveRecord::Rollback) unless object.save(false)
Chris@909:           end
Chris@909:         end
Chris@909:       end ? true : false
Chris@909:     end
Chris@909: 
Chris@909:     private
Chris@909: 
Chris@909:     # Returns the value of the given ciphered attribute
Chris@909:     def read_ciphered_attribute(attribute)
Chris@909:       Redmine::Ciphering.decrypt_text(read_attribute(attribute))
Chris@909:     end
Chris@909: 
Chris@909:     # Sets the value of the given ciphered attribute
Chris@909:     def write_ciphered_attribute(attribute, value)
Chris@909:       write_attribute(attribute, Redmine::Ciphering.encrypt_text(value))
Chris@909:     end
Chris@909:   end
Chris@909: end